Steam Deck keeps forgetting my SD card is already formatted and has games
Basically the title. Sometimes I turn on the deck and the SD card icon is in the top bar, it shows it's connected but doesn't see any games on it and prompts me to format (and also shows it only has 30mb of space). Rebooting and/or removing and reinserting the SD card seems to fix it until the next time. I'm really not sure why, unless the card is failing and I need a new one? This happened on both my old lcd and the new oled deck so I don't think it's the port. Any help would be greatly appreciated!
Sounds like a dying SD card to me.
You should already have this solved by logic. You swapped steam decks and it's still doing this, and you've seen virtually no one ever complain about this with their steam decks.
It's the card. If you haven't already, I would give reformatting it a try. If it ever does it again after that, throw it away.
Unfortunately a brand new card and steam deck later I'm still having the issue. Seems there's more to it than that
Did you buy the same card? What card did you buy and where are you buying them from? Your issue isn't common so it being the same for you with two sets of hardware is crazy. SD has had lots of bugs and issues, but having an uncommon one twice in a row is something else.
When the card doesn't mount properly, how does it show up in desktop mode?
I had a different SD card issue where the deck was automounting my sdcard at a different mount point, which was preventing it from seeing any of the installed games. Ultimately I just changed my mount points/library locations to match how the Deck wanted everything mounted.
This is a known issue according to steam deck discussion page. I get a this issue too from time to time and a restart solves it.